What is the DBB file format?
.dbb is a proprietary binary database file created by legacy Skype clients (versions 5-7). These files were stored in the Skype user profile directory - on Windows, at %AppData%\Skype\<username>\ - and held user profile data, contact lists, call history, and chat message logs in a proprietary binary format.
The .dbb format dates to early Skype releases (circa 2003-2005) and remained in use through Skype 7. It is not human-readable; data is stored in a binary layout with optional obfuscation on some fields such as chat history and profile data. No formal specification has been published by Skype or Microsoft.
Modern Skype (version 8+, released 2017) replaced .dbb files with a SQLite-based main.db / skype.db database, making .dbb effectively obsolete. Microsoft retired Skype entirely on May 5, 2025, migrating all accounts to Microsoft Teams Free. .dbb files are now purely archival or digital-forensics artifacts.
NirSoft SkypeLogView (free, Windows) can parse older .dbb files and display call and chat history in a human-readable form without requiring an active Skype installation. Recovery of data outside of dedicated tools is difficult due to the undocumented proprietary format.
Security & safety
RISK: LOWDBB files are passive data files - they cannot execute. They may contain sensitive personal information (private chat messages, call records, contact details), so treat them as confidential. Do not share DBB files or upload them to untrusted online 'viewers' as they contain private communications history.
Format details
in a nutshell- Calibre E-Book Database - Some Calibre versions use .dbb as an internal database file; context is entirely different from Skype.
Programs that open DBB files
Windows2 apps
NirSoft SkypeLogView
Free Open SkypeLogView, point it to the folder containing the DBB file; it parses and displays call history, chats, and file transfers in a readable table.
Skype (legacy v5-7)
Free Legacy Skype clients opened DBB files natively, but Skype was retired May 5, 2025. Current Skype does not use DBB. Technical details
deep spec| Format type | Binary proprietary database (legacy Skype data store) |
| Developer | Skype Technologies (now Microsoft) |
| Encoding | Binary, little-endian |
| Security | Partial obfuscation on some fields (chat history, profile data); format not formally documented |
| Typical file size | 10 KB - 50 MB (varies with account age and chat volume) |
| Content | User profile, contact list, call history, and chat message logs |
| Profile location (Windows) | %AppData%\Skype\<username>\ |
| Supported client versions | Legacy Skype 5-7 (circa 2003-2017) |
| Superseded by | SQLite main.db / skype.db (Skype 8+, 2017) |
| Platform status | Microsoft retired Skype on May 5, 2025; all accounts migrated to Microsoft Teams Free |
| Supported OS | Windows (primarily); legacy Skype also ran on macOS, Linux, Android, iOS |
| Third-party parsing | NirSoft SkypeLogView can extract call and chat history from .dbb files |
| Released | ~2003-2005 (early Skype client versions) |
| Latest version | No spec version; discontinued - modern Skype uses SQLite .db files |
Community Q&A
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